Molding-machine.



. P. P. WALSTBOM'.

MOLDING MAGHINB' ArPLwA'rroN FILED me. s1, 1909.

Patented June 7,1910. s SHEETS-SHEET 1.v

.11. F. WALSTROM. MOLDING MACHINE. APPLICATION FILED AUG. 31, 1909.

Patented June 7,1910.

2 SHEETS-SHEET 2.

PETER FREDR-ICK WALSTROM, OF BIRMINGHAM, ALABAMA.

MOLDING-MACHINE.

To all whom 'it may concern:

Be it known that I, PETER FREDRIGK WAL- sTRoM, a citizen of the United States, residing at Birmingham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in lVIoldingNIachines, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to improvements in machines for making sand molds for use in casting articles from metals.

The object of the invention is to provide a simple and practical machine of this character which will be entirely automatic in operation and which has improved means for supporting or locking the stripping plate while the pattern is being withdrawn.

With the above and other objects in view, the invention consists of the novel construction, combination and arangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawings in which- Figurel is a view partly in elevation and partly in section of a molding machine embodying my invention. Figs. 2 and 3 are horizontal sectional views taken respectively on the planes indicated by the lines 2-2 and 33 in Fig. 1.. Fig. 4L is a detail vertical section showing' the cam latch for supporting and locking the stripping plate. Fig. 5 is a detail vertical section showing the stops for the pat-tern table. Fig.` G is a perspective view of the pattern table, and Fig. 7 is a perspective view of the upper portion of the frame or support.

Referring more particularly to the drawings 1 denotes a suitable base on which is mounted a frame or support consisting of two side members 2 united by upright members v3, which latter form supporting standards and have their lower ends secured to the base. The upper portions of the end members or upright plates 3 are formed with inwardly extending flanges 4 as seen in Fig. 2, and these flanged upper portions have their inner faces grooved or recessed as shown at 5 to form guide ways for a stripping plate 6.

7 denotes a flask arranged on the stripping plate and adapted to receive the sand into which a pattern or patterns 8 are forced through openings in the stripping plate. While the patterns may be of any shape and size according to the article to be molded,

Specification of Letters Patent.

Application filed August 31, 1909.

Patented J une *7, 1910. serial No. 515,534.

those illustrated are adapted to form molds for making the curved portions of brakeshoes and they are arranged on cross bars or pedestals 9 on the top of a pattern table 10. The latter is at the top of the rod 11 of a piston 12 which works in a cylinder 13 on the base 1. Compressed air or other fluid under pressure is supplied to the bottom of the cylinder 13 by a pipe 14, the admission and exhaust of compressed air being controlled by a suitable valve 15.

Upon the side edges of the pattern table 10 are projecting arms 16 in which are arranged set screws 17 at similar adjustable stops adapted to engage the side members or plates 2 to' limit the upward movement of the pattern table. Said pattern table is also provided upon its four corners with upright guide lugs 13 of angular shape in cross section and arranged for sliding engagement with the flanged upper portions of the end members or uprights 3, as clearly shown in Figs. 3 and l of the drawing. The lugs 18 are also adapted to engage the stripping plate 6 and lift it ofl" of the shoulders 19 formed by the bottom portions of the guide grooves 5, as will be understood on reference to Fig. 4:.

The usual relatively stationary platen 20 is provided, the same being adjustable by means of a screw 21 and removable by being disposed in the usual swinging frame 22.

Depending from the end portions of the stripping plate 6 are supporting and guiding pins 23 which slide through guide lugs 24 on the inner faces of the end members or uprights 3. The lower ends of the pins 23 are adapted to be engaged and supported by latch levers 25 pivoted intermediate their ends 26 on the inner faces of the members 3 and having a curved or cam shaped portion at one end and a counterbalancing weighted portion 27 at its other end. The cam shaped ends of the latch levers 25 are provided with pins 28 to work in slotted portions 29 of links 30 pivoted at 31 to the end portions of the pattern table 10 and depending fromA the latter. Owing to this connection between the pattern table and the latch, said table will have the limited movement independent of the latch for the purpose of allowing the patterns to be withdrawn before the latches release the stripping plate.

In operation, when the piston is in the lower portion of the cylinder and the stripping plate is in lowered position or resting manipulated Y neath the piston 12, whereupon the table on the shoulders 1'9, the patterns and flasks are placed in position, the flasks filled with sand and the stationary platen 20 is adjusted into position. IIhe valve is then to admit compressed air bewill move upwardly and the lugs 18 on its corners will pick up and elevate the stripping plate 6 and the parts thereon so that the sand in the flask willbe compressed around the'pattern. When the parts are in lowered position the pins 28 are in the upper'ends of the slots 29 of the links 30 so that the latch levers or cams 25 will not be the patternsS. However,

ing shoulders 19.

swung Vunder the supporting and guiding pins 23 until the bottom portions of theslots 29 lift the pins v28 on said latch levers.

VW'hen the valve 15i`s again manipulated to permit the air beneath the piston to escape, the weight of the parts supported by the piston will lcause them to descend so that the pattern table 10 will lower or withdraw owing to the disposition o the latch levers or cams 25 beneath the pins'23 the stripping plate will be retained in its elevated "position until the upper portions of the slots 29 engage the pins 28 and swing the latch levers `or cams rom beneath the pins 23, whereupon the stripping plate will drop on to the support- Having thus describedthe invention what is' claimed is:

l 1. In'a moldin machine, the combination o'a stationary p aten, a supporting `iframe, a stripping plate having limited movement in the latter, a pattern table having movementY independent of the stripping plate'and adapted to elevate the same, means for actuating said pattern table, supporting pins eX- tending from the stripping plate, pivoted latch levers upon said frame and having counterbalanced cam portions adapted to engage and support said pins, and links upon the pattern table and having slot and pin 'connection with said latch levers.

2. In a molding machine, the combination of a stationary platen, Va'supporting frame,

a stripping plate having limited movement in the latter, a pattern table havin movement independent of the stripping p ate and adapted to elevate the same, means for actuatin said pattern table, adjustable stops carrled by the table and adapted to engage l said frame to limit the upward movement of the table, supporting pins extending from the stripping plate, pivoted latch levers upon said frame and having counterbalanced cam portions adaptedv to engage and support said pins, and links upon the pattern table and having slot and pin connec-V tion with said latch levers.

3. In a moldin machine, the combination of a stationary p ate/n, a supporting frame, a strippingv plate having limited movement in the latter, a pattern table having move'- ment independent of the stripping plate and adapted' to elevate the same, a fluid pressure cylinder and piston for actuating said pattern table, supporting pins depending from the stripping plate, pivoted latch levers upon said Vframe and `having 'counterbalanced cam portions adapted to engage and support said pins, and links upon the pattern table and having slot and pin connection with said latch levers.

11. In a moldin machine, the combination of a base, uprig t frame members rising therefrom and having at their upper ends inwardly projecting side flanges, the inner faces of the upper ends of said members being' formed with guide recesses, side members uniting the inwardly extending Aflanges of the upright members, a stripping plate slidably engaged with the guide recesses in said upright members, al pattern table formed at its corners with upright angular guide lugs to slidably engage the inner faces of said upright members and to engage and elevate said stripping plate, said table being formed on its Ysides with outwardly projecting lugs having vertical 1 screw threaded openingsV disposed beneath said side members, stop screwsinv said openings of the lugs and adapted to engage 'the bottom edges of said side members, means for actuating the pattern table, means for supporting the stripping plate in elevated-position, a stationary platen, and means actuated by the movement of the attern table for moving said stripping p ate-supporting means into and out of operative position. K

In testimony whereof I hereunto alliX my signature in the ,presence of two witnesses. i Y PETER FREDRICK WALSTROM.

Witnesses M. M. ULLMAN, C. W. I-IARMoN. 

